CODE EXAMPLE FOR PYTHON

import python code from another directory

The solution is very simple, just add a __init__.py file to the directory
where the package or code you want to import is, and then python will treat
that directory as a package. Then is as simple as just importing the code
like any other third party package. Below is a diagram of best practices 
doing this.


package/
    |
    |----- __init__.py (Empty file)
    |------- main_module.py (Contains: import subpackage_1.module_1)        
    |------- module_0.py (Contains: print('module_0 at parent directory, is imported'))
    |           
    |
    |------- subpackage_1/
    |           |
    |           |----- __init__.py (Empty file)
    |           |----- module_1.py (Contains: print('importing other modules from module_1...')
    |           |                             import module_0
    |           |                             import subpackage_2.module_2
    |           |                             import subpackage_1.sub_subpackage_3.module_3)
    |           |----- photo.png
    |           |
    |           |
    |           |----- sub_subpackage_3/
    |                        |
    |                        |----- __init__.py (Empty file)
    |                        |----- module_3.py (Contains: print('module_3 at sub directory, is imported')) 
    |
    |------- subpackage_2/ 
    |           |
    |           |----- __init__.py (Empty file)
    |           |----- module_2.py (Contains: print('module_2 at same level directory, is imported'))